Quite some time ago I modified the default.master page to have MOSS use
dynamic menus (e.g., cascading drop-down menus to navigate through
sites and subsites), and it's been working wonderfully. However, I just
came across a problem and I'm wondering if anyone knows what to do
about it.

On my top-level page, I have the default announcements web part.
However, as soon as I actually add an announcement to the announcement
list, the dynamic menus no longer work on the home page (but do work
from subsequent pages.)

I've tried moving the web part around to no effect. I've tried
deleting the announcement text (just having the title) to no effect.
I've tried deleting the announcement itself, and voila, the dynamic
menus work again.